code: def testTfTensor(self):
      def fn(x):
          return x
  
      t = constant_op.constant(1.0)
      (g,) = backprop.gradients_function(fn, [0])(t)
      self.assertAllEqual(g, 1.0)
  
imports: from tensorflow.python.eager import backprop
  from tensorflow.python.eager import context
  from tensorflow.python.eager import record
  from tensorflow.python.eager import test
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import custom_gradient
  from tensorflow.python.ops import gradients_impl
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import nn_grad
  from tensorflow.python.ops import nn_ops
  from tensorflow.python.ops import variables
label_desc: Use image node_id 7 for calling the TapeTest obj's underlying member method code with example usage: obj.testTfTensor() and returns: x